How to add a line to a multiline TextBox?

Question

How can i add a line of text to a multi-line TextBox?

e.g. pseudocode;

textBox1.Clear();
textBox1.Lines.Add(\"1000+\");
textBox1.Lines.Add(\"750-999\         


        

Answer 1

Above methods did not work for me. I got the following exception:

Exception : 'System.InvalidOperationException' in System.Windows.Forms.dll

Turns out I needed to call Invoke on my controls first. See answer here.